The density of titanium and titanium alloy is only 4.51, which is smaller than that of steel and only half the weight of steel, but its strength is similar to that of ordinary carbon steel. Titanium belongs to thermodynamically unstable metals and is very active. Titanium can form a natural oxide film (titanium dioxide) with air. This stable, strong adhesion and good protective character oxide film determines the corrosion resistance of titanium. Therefore, titanium has excellent corrosion resistance, followed by light texture and high tensile strength, Good mechanical properties are another excellent feature of titanium alloy.
Titanium and the difference between titanium alloy and stainless steel
1. It can be distinguished by color. Titanium is a little dark, showing a cool color. I think it's cool. Titanium is a little darker than steel. Steel is white, pale. The two colors are very obvious, you can see.
2. It can also be distinguished by chemical methods, that is, soak it with nitric acid. Titanium does not react, stainless steel will have a strong reaction as soon as it is put down. The distinction between pure titanium and titanium alloy is difficult to see from the appearance.
3. Titanium can make gray black marks on ceramic tiles, but stainless steel can't make marks.
4. Good corrosion resistance of titanium: titanium alloy is easy to form a dense oxide film below 550 ℃, so it is not easy to be further oxidized. It has high corrosion resistance to gas, seawater, steam and some acid, alkali and soft media.
5. Good thermal strength of titanium: the melting point of titanium alloy is 1660 ℃, which is higher than that of iron and has higher thermal strength. It can work below 550 ℃ and show better toughness at low temperature.
6. Difficult titanium processing: welding, electroplating and cold drawing are very difficult. Welding and electroplating must be carried out under vacuum or full of inert gas (vacuum ion plating).
Titanium alloys are widely used in various fields because of their high strength, good corrosion resistance and high heat resistance.
The density of titanium alloy is generally about 4.51g/cm3, which is only 60% of that of steel. The density of pure titanium is close to that of ordinary steel. Some high-strength titanium alloys exceed the strength of many alloy structural steels. Therefore, the specific strength (strength / density) of titanium alloy is much higher than that of other metal structural materials. See table 7-1. Parts with high unit strength, good rigidity and light weight can be made. Titanium alloy is used for aircraft engine components, skeleton, skin, fasteners and landing gear.
304 is a universal stainless steel, which is widely used to make equipment and parts requiring good comprehensive performance (corrosion resistance and formability). In order to maintain the inherent corrosion resistance of stainless steel, the steel must contain more than 18% chromium and more than 8% nickel. The density is 7.93 g / cm3, which is also called 18 / 8 stainless steel in the industry. High temperature resistance of 800 degrees, with the characteristics of good processing performance and high toughness, it is widely used in industry, furniture decoration industry and food and medical industry.
To sum up, of course, titanium alloy is better than 304 stainless steel .
